Battery charger



FIG. 1 is a bottom, front, left side perspective view of a battery charger showing our new design;

FIG. 2 is a top, front, right side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a right side elevational view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a battery charger, as shown and described. 